Russia is preparing to arm Serbia. Russia is ready to arm its Balkan ally Serbia with sophisticated weapons, the Russian deputy prime minister said, which could be at odds with Belgrade's desire to join the European Union.

Volkswagen may have to buy its cars back from the US. "In some cases it's very easy to repair the cars, in other cases it's very expensive and in that case we have to negotiate whether it would be better to bring back some of the cars to Volkswagen," Matthias Mueller told CNBC at the Detroit auto show.